Which of the following are involved in coating Staphylococcus with host proteins?
A. clumping factor
B. coagulase
C. protein A
D. leukocidin
E. clumping factor, coagulase AND protein A
E.
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How do eukaryotic cells maintain underwound DNA?
A. They have a topoisomerase that can introduce negative supercoils. B. They can introduce negative supercoils by wrapping the DNA around proteins. C. They only relax the positive supercoils that form during transcription and let the negative ones accumulate. D. All of these choices are correct. E. None of these choices is correct.
Antibodies are classified as
a. nucleoproteins. b. immunoglobulins. c. polysaccharides. d. steroids. e. lipids.
Which of the following includes all of the others?
a. sucrose b. glucose c. cellulose d. glycogen e. carbohydrate
Animals with closed circulatory systems are more successful than animals with open circulatory systems.
Answer the following statement true (T) or false (F)